the circuit of the monitor for humidity and temperature of seedling raising greenhouse

Published:2011/6/9 6:35:00 Author:Ariel Wang | Keyword: monitor, humidity, temperature, seedling raising greenhouse | From:SeekIC

When the soil is too wet(the humidity is over the value of upper limit set by RP1),not gate D2 will output high level,not gate D3 will output low level.It lights LED .This indicates the humidity of the soil too high.At the same time,audio alarm circuit works.BL rings.When the soil is too dry(the humidity is lower than the value of low limit set by RP2),not gate D1 will output low level.It lights VL1 .This indicates the humidity of the soil too low.At the same time,audio alarm circuit works.BL rings.



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